A tire manufacturer has been producing tires with an average life expectancy of 26,000 miles. Now the company is advertising that its new tires' life expectancy has increased. In order to test the legitimacy of the advertising campaign, an independent testing agency tested a sample of 6 of their tires and has provided the following data.
Life Expectancy
(In Thousands of Miles)
28
27
25
28
29
25
?
a.Determine the mean and the standard deviation.b.
At the .01 level of significance using the critical value approach, test to determine whether or not the tire company is using legitimate advertising. Assume the population is normally distributed.c.
Repeat the test using the p-value approach.
What will be an ideal response?
a. |  = 27, s = 1.67 (rounded) |
b. | H0: ?< 26 (in thousands of miles) Ha: ?> 26 (in thousands of miles) Since t = 1.467 < 3.365, do not reject H0 and conclude that there is insufficient evidence to support the manufacturer's claim. |
c. | p-value > .1; do not reject H0 |
You might also like to view...
The variable description is:
A) a phrase or sentence that identifies the variable in more detail and refers to the item on the questionnaire B) a phrase or sentence that identifies the variable in more detail but does not refer to the item on the questionnaire C) a label for the possible responses that respond to each data code number D) a label for the data code numbers E) encrypted for privacy reasons
Some companies choose to provide no objective assurance regarding their sustainability reports
a. True b. False Indicate whether the statement is true or false
The four forms of justice, while separate entities, are often intertwined.
Answer the following statement true (T) or false (F)
Emerson Studios has designed its marketing organization along the lines of a ________ organization in which operational specialists head different marketing activities
A) geographic B) product C) functional D) customer E) market